Post-drill frame.



No. 689,766. Patented Dec. -24, I90I.

A. WALKER.

PDST DRILL FRAME.

(Application tiled May, 1901.) (M Modl.)

.Ewen/a?? 2f/#5% zemmzer mzer UNITED STATES "PATENT OFFICE.

ALEXANDER WALKER, OE "WHATOIIEER, IOWA, AssIcNOR To WHAT OHEER DRILL ANDMINERs TOOL oo., OE WHATOHEER, IOWA, A CORPORATION PosT-DRiLL FRAME. f

SPECIFICATION forming part of Letters Patent No. 689,766, dated December-24, 190i.

Application tied May s, 190i. serial No. tasse. (No model.)

1o and described in my prior patent, No. 463,469,

dated November 17, 1891, and has for its object to provide a drill-framehaving certain novel features of construction whereby the structure as awhole will be light and simple r ,and possess .great strength.

In order to enable my invention to be clearly understood, I haveillustrated the same in the accompanying drawings, in which- Figure 1 isa perspective view of the drill-f 2o frame.

Fig. 2 is a transverse section thereof, taken through one of the endcastings. Fig. 3 is a detail View of one of the sidev bars, and Fig. 4is a like View of an end casting. n

Referring now to the drawings, l indicates 2 5 the side bars of thedrill frame or post,which are formed of plates of metal provided ontheir inner sides with flat bearing-faces and with central longitudinalgrooves 2, eXtendl ing throughout the length of the bars. Said 3o barsare thickened or conveXed longitudinally, as indicated at 3, so thatthey shall not be weakened by the provision of the grooves 2. On thecontrary, said bars constructed as described are much stronger thanordinary flat metal bars would be on the principle well understood bythose familiar with'metal constructions. has a flange extension 4, whichis provided with a series of recesses 5 toreceive the 4o trunnions ofthe gear-box, as usual. At their upper ends the side bars are united toan end casting, which consists of a central cylindrical` sleeve 6,provided on opposite sides with thick integral webs 7 ,terminating inrela- 4 5 tively wide iianges 8, which have their outer sides flat tobear against the faces of the side bars and provided with tongues 9,adapted to be received and t closely in the grooves 2 of the side bars.The end casing is secured in 5o position by means of cap-screws 10passing At one side each of the lbai-s1 through openings inthe side barsand engaging in suitable screw-threaded openings in said casting. Uponone sidelof the sleeve 6, which forms a boxfor an extension-pipe 11, iscast a boss or nipple l2, having a threaded opening for aset-screw 13,by means of which the extension-pipell may be locked in any desiredadjusted position. At their lower ends the side bars are connected to anend casting 14, similar in all material respects to the one describedand differing therefrom only in the provision of a female thread in thecentral sleeve or box, which receives a jackscrew 15, having .a handleor lever 16, as usual. Y

By the construction of side bars above described I ain enabled todispense with separate trunnion-support-ing plates, such as shown in mypatent named, and also with the side iianges on the end castings forembracing the edges of the side bars, as the tongue-andgroove connectionshown answers all the purposes of thesev anges-that is to say, theengagement of the tongues 9 in the grooves 2 operates to hold theend'castings in firm fixed relation to the side bars.

Having thus fully described my invention, what I claim as new is- 1. Apost-drill framehaving side bars each of which is in the form of a metalbar flat on its inner side and provided on said inner side with acentral longitudinal groove and a corresponding thickened portionopposite said groove.

2. A post-drill frame having side bars,each of which is in the form of ametal bar flat on its inner side and provided with a centrallongitudinal groove, and end castings secured between said bars atopposite ends thereof and having on Opposite sides tongues seated insaid grooves. Y p y Y 3. A post-drill frame having side bars,eacl1 ofwhich is in the form of a'frnetal bar at on its inner side and providedwith a central longitudinal groove and an integral anged eX- tension4'provided with recesses 5.

4. A post-drill frame having side bars,'each of which is provided with aiiat bearing-surface and with a central `longitudinal groove, and endcastings secured between said bars IOO site ends thereof and having onopposite sides x tongues seated in said grooves.

In testimony whereof I have hereunto set my hand in presence of twosubscribing witmesses.

ALEXANDER WALKER. Witnesses:

JESSE N. SOUTHWICK, JAMES DAVISON.

